Provision of rip wires in canisters



" June ,1944. R BOGNER 2,350,870

PROVISION OF RIP-WIRES IN CANIS'IERS Original Eiled March 7, 1940 mama! Patented June 6, 1944 PROVISION OF RIP WIRES IN CANISTERS Peter Bogner, Uxbridge, England, assignor to Saml. Hanson & Son Limited, London, England, a British company Original application March 7, 1940, Serial No.

322,748. Divided and this application August 6, 1940, Serial No. 351,619. In Great Britain December 22, 1938 6 Claims. (01. 220-49) This application is a divisional of my co-pending United States application Serial No. 322,748, filed 7th March, 1940, for improvement in The provision of wire-rips in canisters, and now main position so that the wire cannot become accidentally displaced during the handling of the end-closure or during the seaming operation in which the end-closure is attached to the cantured into Patent 2,329,328. 6 body, 7 This invention is for improvements i 1' re- Preferably the walls of the ridge are pressed l ne to the provision of rip-Wires in canisters together sufficiently to cause the rip-wire to be or-the like and is concerned with a canister endi d nt i t th material of Said n This c s e a a p-wire secured in place therewill not only serve to hold the wire more firmly on. Q in place, but will also form a line of weakening In the present specification and claims the term along which, in the finished can, the material of canister is used generically to include all sheet t end-c1osure may be readily t when penmetal containers irrespective of the shape, form ing t can d e s Such Containers y haVe- It is preferred in carrying out the invention to One O j t if the invention is to facilitate 2 59 provide a shoulder around the centre of the detention of the rip-wire in a desiredlocation on the pression as described in United States Patent e d- No. 2,277,066. That is to say it is preferred to Another object is to Provide 0911151561 have the material of the closure between the cenclosllle With a rip-Wire which is held securely in tral depression and marginal flange continued Place by being clinched in ridge or groove (29 outwardly from the depression in the form of a formed in the material of the end-closure, so Shoulder, with the said ridge extending around that during the seaming of the end-closure to the Said shoulden body of the canister the wire cannot be displaced The a ridge may be interrupted to form a fromits proper positiongap and one end of the rip-wire may protrude A further object is to providea can end-elosure threugh an opening at one end of the ridge at having a rip'wire located placg m rldge 9 the gap. Alternativelythere may be provided groove in the end-closure with the Walls of said e continuous ridge which is reduced in height ridge or q pressed together to indent over a short distance, and one end of the rip- 'w Into them so as Secure the 30 wire may protrude through an opening in the np'wlre m place and 9 Q 1 of weak" ridge at a junction between the reduced portion ening in each wall facilitat ng opening of the and the main portion of the ridge. finished can by h During clinching of the walls of the ridge, Yet h oblect provlde t endthere is some tendency for the material of the closure which has a rip-wire secured to it and ridge to be split or become porous thereby which can be readlly seamed to Can'body by venting the formation of a proper seam if the a normal seaming process. I A still further object is to provide an improved :3? fi z i ggfi gg ig 322:3? iggig zgi end-closure which rip-Wire protruding at the general plane of the end-closure To reduce .omi end to the-outslde of en-d c1o-Sure and this tendency the invention further provides a Which can readlly have the np'wlre clinched m canister end-closure formed with o t vplace without risk of splitting the material of receive a ri Wire d move h jin a e g "the end-closure in the neighbourhood of hthe loface p g the pissag Uf th; m e38 jgi gggi w the Wlre prolects through t 8 end in such a way that the aperture is raised above The invention accordingly provides for a can- 4 w 311110131011 between the ridge e ose p01- ister an end-closure having a central depression 35 of the mammal of camster Whlch are to fit within the can-body and a marginal flange posltlcnd laterally of the rldge- 'for interfoldmg. with the cembedy and having Certain preferred forms of; end-closures are :aridge formed in the material of the closure }1111Strate1 y Way of example in the accompanyaround the central depression and a rip-wire conmg drawmg and P descrlbed 71th tained in said ridge and the walls of the ridge Greece 0 the drawing in wh ch-- clinched together continuously along the whole Fleure 1 1s a detall View in {floss-section f a lengthof the ridge to grip the rip-wire. The portlqn 0? 9 e s t appears before :clinching of the walls of the ridge together as the rlp-wire is app I aforesaidiwill' serve to hold the rip-Wire securely Figure 2 1s a vlew corresponding to Fi 1 but showing the rip-wire in place and the walls of the ridge clinched together.

Figure 3 is a view corresponding to Figure 2 showing the walls of the ridge pressed together to indent the rip-wire into the material of said wall.

Figure 4 is a fragmentary View of a portion of an end-closure, seen from the underside, with the rip-wire secured in place.

Figure 5 is a perspective view of a wired endclosure with a portion of the latter broken away to illustrate its cross-section.

Figures 6, 7 and 8 are respectively an end view, a side view and a plan view of the end portion of a wire-receiving ridge or groove,

Figure 9 is a side view in cross-section of the end of the ridge or groove showing a rip-wire passing through it, and

Figure 10 is a side View of a reduced portion of a continuous wire-receiving ridge or groove formed in an end-closure.

Like reference numerals indicate like parts throughout the drawing.

In Figure 1 there is shown a portion of a can end-closure indicated generally at 4'! formed as described in United States Patent No. 2,277,066. The end-closure is formed with a central depression 69 and a marginal flange I2, and it will be seen that the material of the end-closure between the depression 69 and flange I2 is continued outwardly from the depression in the form of a shoulder I0, and an upstanding rip-wire receiving ridge or groov 1| extends around the shoulder 10. The side walls of the ridge 1| are shown at 13. The ridge is formed by a fold in the material of. the closure. The end-closure 41 is adapted to be seamed to a canister body by interfolding the marginal flange 12 with a seaming flange on the canister body.

In applying the invention to an end-closure of the form shown in Figure 1 a rip-wire 4B is inserted into the ridge or groove II and the side walls I3 of the latter are clinched together continuously along the whole length of the ridge to grip the rip-wire, as shown in Figure 2. The clinching of the walls 13 together may be carried out by the use of apparatus as described in my United States Patent application No. 322,748 in which the walls 13 of the ridge H are gripped between rotatable rollers 2| and 22 while the end-closure is supported by a holder 28. The side walls 13 of the ridge II are urged together around the rip-wire 46. The material of the ridge II of the end-closure-is thus brought to a re-entrant channel formation or to the form of a substantially closed tube containing the ripwire 46.

The end-closure in the most preferred form of the invention also has the side walls 13 of the ridge or groove H pressed together and in contact on opposite sides of the wire, as indicated in Figure 3 sufficiently to cause the rip-wire 45 to bite or be indented into the material of said walls. Thin places as indicated at I4 ar thereby formed in the outside and inside walls I3 of the ridge II, and the thin portion I4 of the outer wall 13 of the ridge may conveniently form a line of weakening to facilitate opening the completed canister by the use of the rip-wire 46. The pressing together of the side walls 13 of the ridge may be carried out as described in my United States Patent applicationNo. 322,748 by the employment of additional presser or gripper rollers 63 and 64.

Figure 5 shows in perspective the form of the end-closure as a whole with the side walls 13 of the ridge 1| pressed together along the whole length of the ridge II. It will be seen that the ridge is interrupted to form a gap I04 and one end of the rip-wire indicated at I6 protrudes through an opening at one end of the ridge at the gap I04, this opening being indicated at I 02 in Figures 6 to 9. The projecting end 16 of the rip-wire may be formed to a loop as shown at 82 in Figure 5 and anchored by solder or otherwise at 83 to the central part of the end-closure. The other end of the rip-wire is left inside the end-closure as indicated at I5 in Figure 4 which is an enlarged view of a portion of the end-closure near the gap I04 as seen from underneath the end-closure. The end of the ridge 'II adjacent to the end 15 of the rip-wire may be inclined as indicated at I06, see Figure 5. During the subsequent seaming of the end-closure to a can-body the end 15 of the rip-wire may conveniently be embedded in the seam to assist in ensuring proper operation of the rip-Wire when opening the can.

The clinching and pressing together of the walls 13 ofthe ridge II should preferably stop slightly short of the ends of the ridge to avoid splitting the material of the end-closure at these points. In order to assist further in avoiding the tendency for splitting the material of the end closure, the invention provides an improved formation of the ridge at its ends as shown in Figures 6 to 9. The ridge or groove 41 has an inclined end face IOI adjacent to the gap I 04, as shown most clearly'in Figures 7 and 9, and the end face I! is formed with the aperture I02 for the passage of the rip-wire 46. It will be seen that the aperture I02 is raised above the junction between the ridg 41 and those portions of the material of the closure which are positioned laterally of the ridge. This is found to assist the clinching of the side walls 13 of the ridge II close to the end of the latter without splitting the material of the end-closure and also to !acilitate sealing the opening around the rip-wire.

Figure 10 illustrates a modification wherein the ridge II instead of being discontinuous is formed with a reduced portion at I05 corresponding to the gap I04. In other words the ridge is continuous and reduced in height over a short distance corresponding to the gap shown in Figure 5. The inclined portions IM and I06 constitute end faces defined by the reduction in height of the continuous ridge and they correspond to the end walls of the discontinuous ridge. The aperture I02 for the rip-wire is formed in the inclined portion Ifll, that is to say between the reduced portion and the main portion of the ridge, and is thus raised above the level of the material on either side of the ridge.

In Figure 9 the wire 46 is shown projecting through the opening I02 and the space between the opening and the wire is shown as being filled up with sealing composition at I03 which may be applied externally or internally and may be extended somewhat beyond the opening I02 on the outside or the inside of the end-closure. The sealing composition may be solder or any other suitable material. Th space between the ripwire and the opening I02 in the construction of Figure 10 may be similarly filled up with sealing composition.

' In any of the forms of construction shown the interior of the marginal flange I2 of the endclosuremay be provided as usual with a gasket of sealing composition such as a latex compound,

and this may be applied to the underside of the marginal flange in known manner and extended inwardly to reach across the clinched side Walls 73 of the ridge 1! and fill the shallow recess formed on the inside of the end-closure immediately below the portions of the walls 13 which are in engagement or substantial engagement with one another.

It will be appreciated that the clinching of the walls 73 of the ridge ll around the rip-wire 46 will serve to hold the latter in place during handling of the end-closure and also during the seaming of the end-closure to a can-body. The frictional grip between the rip-wire 46 and the clinched side walls 73 of the ridge will also usually be sufficient, particularly when the walls 13 are pressed together as shown in Figures 3 and 5, to prevent the rip-wire from sliding along the ridge when a pull is exerted on the projecting end 15 of the wire when opening a completed canister. However as above indicated the end 15 of the ripwire may be embedded in the seam to assist in avoiding such slippage of the wire along the ridge. Since the lines of weakening are formed by the Wire,

I eliminate the step of locating the wire properly with respect to said lines as has been necessary in rip-wire closures known heretofore. The wire also reinforces the lines of weakening against accidental rupture in the handling incident to filling, seaming and packing.

To illustrate that the housing of the rip-wire in the ridge in the end-closure is quite independent of the formation of the seam by which the end-closure is secured to the can-body, and also to show how firmly the rip-wire is held in place. it can be stated that the rip-wire could be used for tearing open the central part of the endclosure equally as well before the end-closure is seamed to the can-body as after these parts have been seamed together.

It is to be understood that the invention is not restricted to the precise constructional details shown in the drawing. In some cases the endclosure need have no shoulder such as H1 and the ridge H 'may be formed as a continuation of the material forming the central depression 69.

I claim:

1. A closure for sheet metal containers com- I prising a sheet metal disc having a marginal flange adapted to be lock-seamed to a container body, said disc also having an upstanding ridge spaced inwardly of said flange, said ridge being provided by a fold in the material of the disc and including side walls, a rip wire disposed between said walls, said walls being in contact with each other on opposite sides of said wire, and said wire biting into the inner surfaces of the walls, thereby forming lines of weakening in said walls and effecting a union of the wire with the closure such as to maintain the assembly thereof during handling and lock-seaming and reinforcing the weakened ridge sufficiently to withstand the stresses incident to such treatment, said ridge being discontinuous and having at least one end sloping downwardly into the general plane of the disc, and an opening in said sloping end above said plane, one end of said wire protruding through said opening.

2. A closure for sheet metal containers comprising a sheet metal disc having a marginal flange adapted to be lock-seamed to a container body, said disc also having an upstanding ridge spaced inwardly of said flange and including side walls provided by a fold in the material of the disc, and a rip wire disposed between said walls, said Walls being compressed onto opposite sides of the wire and said wire biting into the inner surfaces of said walls, thereby forming lines of weakening in said walls and effecting a union of the wire with the closure such as to maintain the assembly thereof during handling and lockseaming and reinforcing the weakened ridge sufficiently to withstand the stresses incident thereto.

3. A closure as defined by claim 2 characterized by said ridge being discontinuous and having at least one end sloping downwardly into the general plane of the disc, and an opening in said sloping end above said plane, one end of said wire protruding through said opening.

4. A closure as defined by claim 2 characterized by said ridge being continuous and having a portion of reduced depth connected to the remainder by sloping surfaces, and an opening in at least one such surface, one end of said wire protruding through said opening.

5. A closure for sheet metal containers comprising a sheet metal disc having a marginal flange adapted to be lock-seamed to a container body, said disc also having an upstanding -ridge spaced inwardly of said flange and including side walls provided by a fold in the material of the disc, and a rip wire disposed between said walls, said walls being compressed onto opposite sides of the wire and into contact with. each other on opposite sides of the wire with said wire biting into the inner surfaces of said walls, thereby forming lines of weakening in said walls and effecting a union of the wire with the closure such as to maintain the assembly thereof during handling and lock-seaming and reinforcing the weakening ridge sufficiently to withstand the stresses incident thereto.

6. A closure for sheet metal containers comprising a sheet metal disc having a marginal flange adapted to be lock-seamed to a container body, said disc also having an upstanding ridge spaced inwardly of said flange and including side walls provided by a fold in the material of the disc, and a rip-wire disposed between said walls of the ridge medially of the depth thereof, said ridge being compressed on opposite sides throughout its depth to bring said walls in closer proximity to one another at locations on opposite sides of said wire than at said medial location of said wire and said wire biting into the inner surfaces of said walls, thereby forming lines of weakening in said walls and effecting a union of the wire with the closure such as to maintain the assembly thereof during handling and. lockseaming.

PETER BOGNER. 

